I don't think FHWA will yank the money if the church can't progress the study (despite grant guidance that states otherwise), but the delay due to the learning curve may actually make ODOT's concept of a later demolition a de facto reality.
ODOT needs to get on the ball then and just build a new freeway and ensure it won’t be torn down for at least 70 years.
I don't think ODOT has any intent to actually demolish the freeway. Historically they have taken a dim view of this whole urbanism thing. Take a look at how the Oklahoma City Boulevard was built in the old I-40 footprint–nothing about that screams that they took the assignment seriously, at least from the perspective of someone with an urbanist mindset. ODOT is still in the classic DOT mindset of wanting to move cars. This is probably why community leaders had a church apply for a grant rather than going through ODOT.
ODOT is only saying 30 years is the minimum that they could implement an alternative place to send all that traffic, not that they are for sure going to do it 30 years from now. Anytime ODOT thinks they want to pursue a project it gets put at the end of an 8-year plan. Many times as things advance they get bumped back from year 4 to year 6 or whatever because there is no funding. So something might stay in year 6 of the 8-year plan for 10 years until funding becomes available. And it might quietly disappear from the plan during that timeframe too.
And that brings us around to the Legislature. Finding a place to put those 74,000 cars a day is no easy task. The Springdale to Enid interstate will be in this area too and that might raise traffic levels. This will be a bigger and more expensive project than the OKC I-40 realignment, and that required constant pressure from the Governor's office to get the Legislature to cough up the money to get it done. Neither the Oklahoma Legislature nor the current Governor are progressive enough to care about this issue at all, much less commit any money toward it. The Republicans have an 81-20 majority in the Oklahoma House right now, so you're going to have to convince a whole bunch of Republicans to support this (which would mean convincing them to not think about the word "woke" for ten seconds) or you are going to have to get a shitload of Democrats in the Legislature representing districts far from Tulsa. Neither of those are going to happen, so this project is dead on arrival.